fix: Context manager crashes in monitoring mode

The context managers tried to write to the process image in
monitoring=True mode. This is not allowed and the application crashed
 with an error.

Signed-off-by: Sven Sager <akira@narux.de>

src/revpimodio2/io.py

@@ -115,7 +115,8 @@ class IOList(object):
             self.__modio._imgwriter.newdata.clear()
 
         # Write outputs on devices without autorefresh
-        self.__modio.writeprocimg()
+        if not self.__modio._monitoring:
+            self.__modio.writeprocimg()
 
         if self.__modio._imgwriter.is_alive():
             # Wait until imgwriter has written outputs

src/revpimodio2/modio.py

@@ -218,7 +218,8 @@ class RevPiModIO(object):
         return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
-        self.writeprocimg()
+        if not self._monitoring:
+            self.writeprocimg()
         self.exit(full=True)
         self._looprunning = False
         self._context_manager = False